使用zabbix监控TCP连接状态

一 监控原理

$ /bin/netstat -an|awk '/^tcp/{++S[$NF]}END{for(a in S) print a,S[a]}'

TIME_WAIT 3464

FIN_WAIT1 31

FIN_WAIT2 3

ESTABLISHED 12

SYN_RECV 6

CLOSING 8

LISTEN 7

可以使用man netstat查看TCP的各种状态信息描述

ESTABLISHED       socket已经建立连接

CLOSED            socket没有被使用，无连接

CLOSING           服务器端和客户端都同时关闭连接

CLOSE_WAIT        等待关闭连接

TIME_WAIT         The socket is waiting after close to handle packets still in the network. 表示收到了对方的FIN报文，并发送出了ACK报文，等待2MSL后就可回到CLOSED状态

LAST_ACK          The remote end has shut down, and the socket is closed. Waiting for acknowledgement. 远端关闭，当前socket被动关闭后发送FIN报文，等待对方ACK报文

LISTEN            监听状态

SYN_RECV          接收到SYN报文

SYN_SENT          已经发送SYN报文

FIN_WAIT1         The socket is closed, and the connection is shutting down

FIN_WAIT2          Connection is closed, and the socket is waiting for a shutdown from the remote end.

2.监控脚本编写

tcp_connection_status.sh

#!/bin/bash
#this script is used to get tcp and udp connetion status
#tcp status
metric=$1
tmp_file=/tmp/tcp_status.txt
/bin/netstat -an|awk '/^tcp/{++S[$NF]}END{for(a in S) print a,S[a]}' > $tmp_file

case $metric in
   closed)
          output=$(awk '/CLOSED/{print $2}' $tmp_file)
          if [ "$output" == "" ];then
             echo 0
          else
             echo $output
          fi
        ;;
   listen)
          output=$(awk '/LISTEN/{print $2}' $tmp_file)
          if [ "$output" == "" ];then
             echo 0
          else
             echo $output
          fi
        ;;
   synrecv)
          output=$(awk '/SYN_RECV/{print $2}' $tmp_file)
          if [ "$output" == "" ];then
             echo 0
          else
             echo $output
          fi
        ;;
   synsent)
          output=$(awk '/SYN_SENT/{print $2}' $tmp_file)
          if [ "$output" == "" ];then
             echo 0
          else
             echo $output
          fi
        ;;
   established)
          output=$(awk '/ESTABLISHED/{print $2}' $tmp_file)
          if [ "$output" == "" ];then
             echo 0
          else
             echo $output
          fi
        ;;
   timewait)
          output=$(awk '/TIME_WAIT/{print $2}' $tmp_file)
          if [ "$output" == "" ];then
             echo 0
          else
             echo $output
          fi
        ;;
   closing)
          output=$(awk '/CLOSING/{print $2}' $tmp_file)
          if [ "$output" == "" ];then
             echo 0
          else
             echo $output
          fi
        ;;
   closewait)
          output=$(awk '/CLOSE_WAIT/{print $2}' $tmp_file)
          if [ "$output" == "" ];then
             echo 0
          else
             echo $output
          fi
        ;;
   lastack)
          output=$(awk '/LAST_ACK/{print $2}' $tmp_file)
          if [ "$output" == "" ];then
             echo 0
          else
             echo $output
          fi
         ;;
   finwait1)
          output=$(awk '/FIN_WAIT1/{print $2}' $tmp_file)
          if [ "$output" == "" ];then
             echo 0
          else
             echo $output
          fi
         ;;
   finwait2)
          output=$(awk '/FIN_WAIT2/{print $2}' $tmp_file)
          if [ "$output" == "" ];then
             echo 0
          else
             echo $output
          fi
         ;;
         *)
          echo -e "\e[033mUsage: sh  $0 [closed|closing|closewait|synrecv|synsent|finwait1|finwait2|listen|established|lastack|timewait]\e[0m"
  
esac

3.添加zabbix配置文件

tcp_status.conf 

UserParameter=tcp.status[*],/usr/local/zabbix/bin/tcp_connection_status.sh $1

sudo service zabbix-agent restart

4.在master或proxy端使用zabbix_get测试

/usr/local/zabbix/bin/zabbix_get -s 192.168.1.179 -p 10055 -k tcp.status[timewait]

5.添加zabbix监控模板

模板参考附件